autobuild[sn-devel-144]: intermittent test failure detected

[autobuild]

The autobuild test system (on sn-devel-144) has detected an intermittent failing test in 
the current master tree.

The autobuild log of the failure is available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-24-1256/flakey.log

The failure seems to be in the "samba-none-env" suite, whose build logs are available here:

   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-24-1256/samba-none-env.stderr
   https://git.samba.org/autobuild.flakey.sn-devel-144/2018-12-24-1256/samba-none-env.stdout
  
The top commit at the time of the failure was:

commit be2a67319d1b0f423d8fa19137c9a953398ddd50
Author: Stefan Metzmacher <metze at samba.org>
Date:   Wed Oct 31 15:55:57 2018 +0100

    auth/gensec: enforce that all DCERPC contexts support SIGN_PKT_HEADER
    
    That's currently always the case and will simplifies the callers.
    
    WORKS now???
    TDB_NO_FSYNC=1 buildnice make -j test FAIL_IMMEDIATELY=1 SOCKET_WRAPPER_KEEP_PCAP=1 TESTS='samba4.rpc.lsa.secrets.*ncacn_np.*Kerberos.*Samba3.*fl2000dc'
    and
    TDB_NO_FSYNC=1 buildnice make -j test FAIL_IMMEDIATELY=1 SOCKET_WRAPPER_KEEP_PCAP=1 TESTS='samba3.rpc.lsa.*ncacn_ip_tcp.*nt4_dc'
    
    Signed-off-by: Stefan Metzmacher <metze at samba.org>
    Reviewed-by: Jeremy Allison <jra at samba.org>
    
    Autobuild-User(master): Jeremy Allison <jra at samba.org>
    Autobuild-Date(master): Sun Dec 23 21:33:51 CET 2018 on sn-devel-144

and the last 50 lines of the stdout log were:

[182(3116)/218 at 18m17s] pidl.samba3-srv
[183(3117)/218 at 18m17s] pidl.tdr
[184(3123)/218 at 18m17s] pidl.test_util
[185(3129)/218 at 18m17s] pidl.typelist
[186(3185)/218 at 18m17s] pidl.util
[187(3257)/218 at 18m17s] pidl.wireshark-conf
[188(3306)/218 at 18m18s] pidl.wireshark-ndr
[189(3346)/218 at 18m18s] tdb.python
[190(3400)/218 at 18m18s] samba.tests.dsdb_lock
[191(3407)/218 at 19m33s] samba.tests.samba_tool.visualize
[192(3418)/218 at 19m36s] samba.tests.samba_tool.provision_password_check
[193(3422)/218 at 19m45s] samba.tests.samba_tool.help
[194(3423)/218 at 20m40s] samba.tests.domain_backup_offline
[195(3427)/218 at 22m3s] samba.tests.lsa_string
[196(3431)/218 at 22m3s] samba.tests.loadparm
[197(3434)/218 at 22m3s] samba4.blackbox.samba3dump
[198(3435)/218 at 22m3s] samba4.blackbox.upgrade
[199(3443)/218 at 22m29s] samba4.blackbox.provision.py
[200(3450)/218 at 23m17s] samba4.blackbox.supported_features
[201(3456)/218 at 23m26s] samba4.blackbox.start_backup
[202(3459)/218 at 23m35s] samba4.blackbox.upgradeprovision.current
[203(3466)/218 at 24m40s] samba4.blackbox.setpassword.py
[204(3472)/218 at 24m51s] samba4.blackbox.newuser.py
[205(3483)/218 at 25m3s] samba4.blackbox.group.py
[206(3512)/218 at 25m23s] samba4.blackbox.provision-backend
[207(3516)/218 at 25m31s] samba4.blackbox.renamedc.sh
[208(3527)/218 at 25m53s] samba4.dsdb.samdb.ldb_modules.unique_object_sids
[209(3533)/218 at 25m54s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.tdb
[210(3544)/218 at 25m54s] samba4.dsdb.samdb.ldb_modules.encrypted_secrets.mdb
[211(3555)/218 at 25m54s] lib.audit_logging.audit_logging
UNEXPECTED(failure): lib.audit_logging.audit_logging.test_audit_get_timestamp(none)
REASON: Exception: Exception: difftime(after, actual) >= 0
../../lib/audit_logging/tests/audit_logging_test.c:827: error: Failure!

FAILED (1 failures, 0 errors and 0 unexpected successes in 0 testsuites)

A summary with detailed information can be found in:
  ./bin/ab/summary
TOP 10 slowest tests
samba.tests.docs -> 284
samba4.blackbox.upgradeprovision.release-4-0-0 -> 114
samba4.blackbox.upgradeprovision.alpha13 -> 112
samba4.blackbox.schemaupgrade -> 97
samba.tests.domain_backup_offline -> 82
samba.tests.dsdb_lock -> 75
samba4.blackbox.dbcheck.release-4-0-0 -> 73
samba4.blackbox.dbcheck.release-4-1-0rc3 -> 68
samba4.blackbox.upgradeprovision.current -> 65
samba.tests.samba_tool.help -> 56
ERROR: test failed with exit code 1